The invention relates to an internal combustion engine gas exchange valve actuator and is used to displace one or more internal combustion engine valves thereby improving the operation and extending the capabilities of the engine. The actuator includes a casing (2) attached to the engine head (1) and with a hollow cylinder (3) formed inside it and containing a reciprocating piston (6) with a piston rod. Provision is made in the casing (2) which is closed by a cap (4), for a loop for controlled charging and discharging of the pressurized fluid and for a solenoid valve with direct electromagnetic control. The solenoid valve is positioned above the piston (6) and is formed as a plunger (19) having a lower cylindrical widening with axial orifices (20) and an upper part with a central recess (22) and radial orifices (23) and (24).

A fully variable electro-hydraulic valve system having a buffering function, comprising: a camshaft (101), a valve assembly (106), a sliding sleeve (103), a spiral shaft (102), a piston (105), and a position restoring spring (104); the sliding sleeve (103) is fixed relative to an engine; the piston (105) abuts against the valve assembly (106); the spiral shaft (102) is controlled by a cam surface of the camshaft (101) in the axial direction; a spiral surface (102E) is provided at a first end of the spiral shaft (102), and a control gear (102A) is provided at a second end thereof; the sliding sleeve (103) is provided with a buffering oil hole (123) that communicates with a buffering cavity (R), and the buffering oil hole (123) communicates with a low-pressure oil circuit of the engine by means of a throttling device (124). When a valve is going to be seated, the piston (105) firstly collides with a buffering ring (121); due to the effect of the throttling device (124), engine oil within the buffering cavity (R) has a damping effect on the movement of the buffering ring (121), such that the valve is slowly seated, thus reducing the impact damage caused to the valve and a sealing surface of a valve seat, thereby effectively prolonging the service life of a valve system.

A fully variable electro-hydraulic valve system having a buffering function, comprising: a camshaft (101), a valve assembly (106), a sliding sleeve (103), a spiral shaft (102), a piston (105), and a position restoring spring (104); the sliding sleeve (103) is fixed relative to an engine; the piston (105) abuts against the valve assembly (106); the spiral shaft (102) is controlled by a cam surface of the camshaft (101) in the axial direction; a spiral surface (102E) is provided at a first end of the spiral shaft (102), and a control gear (102A) is provided at a second end thereof; the sliding sleeve (103) is provided with a buffering oil hole (123) that communicates with a buffering cavity (R), and the buffering oil hole (123) communicates with a low-pressure oil circuit of the engine by means of a throttling device (124). When a valve is going to be seated, the piston (105) firstly collides with a buffering ring (121); due to the effect of the throttling device (124), engine oil within the buffering cavity (R) has a damping effect on the movement of the buffering ring (121), such that the valve is slowly seated, thus reducing the impact damage caused to the valve and a sealing surface of a valve seat, thereby effectively prolonging the service life of a valve system.

An internal combustion engine includes an electro-hydraulic system for variable actuation of intake valves where each cylinder has two intake valves, associated with two intake conduits. A first conduit is generates within the cylinder a tumble motion of airflow introduced therein, when the intake valve associated thereto is at least partially opened. The second intake conduit generates within the cylinder a swirl motion of airflow introduced therein when the second intake valve is at least partially opened. A controller of controls one or more control valves to open only one of the intake valves of each cylinder in a condition of reduced engine operation, below a predetermined load and/or a predetermined speed of the engine, and to always open both intake valves in the remaining conditions of engine operation. The first intake valve is the only valve to be opened in the reduced engine operation condition.

An internal combustion engine includes an electro-hydraulic system for variable actuation of intake valves where each cylinder has two intake valves, associated with two intake conduits. A first conduit is generates within the cylinder a tumble motion of airflow introduced therein, when the intake valve associated thereto is at least partially opened. The second intake conduit generates within the cylinder a swirl motion of airflow introduced therein when the second intake valve is at least partially opened. A controller of controls one or more control valves to open only one of the intake valves of each cylinder in a condition of reduced engine operation, below a predetermined load and/or a predetermined speed of the engine, and to always open both intake valves in the remaining conditions of engine operation. The first intake valve is the only valve to be opened in the reduced engine operation condition.

The disclosure relates to a hydraulic unit of an electrohydraulic gas exchange valve control system of an internal combustion engine. The hydraulic unit includes a hydraulic housing having a receiving opening, a piston guide, and a slave piston. The piston guide is fastened in the hydraulic housing by way of self-staking with a wall of the receiving opening.

The piston guide includes an outer part that brings about the self-staking and an inner part that guides the slave piston. An inner surface of the outer part is radially interspaced from the outer surface of the inner part in an axial region of the self-staking and the outer part and the inner part are connected in an axially form-locked manner so that a first end section of the outer part facing the gas exchange valve is partially or fully formed into an outer circumferential recess of the inner part.

A fully variable electro-hydraulic valve system, comprising a sliding sleeve (A103, B103), a spiral shaft (A102, B102), a piston (A105, B105), and a reset spring (A104, B104); the sliding sleeve (A103, B103) is fixed relative to an engine; the piston (A105, B105) abuts against a valve assembly (106); the spiral shaft (A102, B102) is axially controlled by a cam surface of a camshaft (101); and the spiral shaft (A102, B102) is provided with a spiral groove (A102D, B102D) and a blockage part (A102G, B102G). When the spiral groove (A102D, B102D) communicates with a limiting oil hole (A118, B118), a sliding sleeve cavity (Q) communicates with a low-pressure oil path of the engine for pressure relief; a spiral shaft axial projection portion (A102C, B102C) is provided at a first end of the spiral shaft (A102, B102); the spiral shaft axial projection portion (A102C, B102C) is provided with a spiral shaft abutting plane (A102B, B102B); a piston axial projection portion (A105A, B105A) is provided at the end of the piston (A105, B105) opposite to the spiral shaft (A102, B102); and the head portion of the piston axial projection portion (A105A, B105A) is provided with a piston abutting plane (A105B, B105B). The present invention solves the problem in which the normal operation of the system is affected due to machine oil loss in a sliding sleeve cavity, and enables the crank angle corresponding to a valve opening moment to remain unchanged, and is particularly suitable for applying to the control of the intake valve variable stroke of an engine having a scavenging process.

A fully variable electro-hydraulic valve system, comprising a sliding sleeve (A103, B103), a spiral shaft (A102, B102), a piston (A105, B105), and a reset spring (A104, B104); the sliding sleeve (A103, B103) is fixed relative to an engine; the piston (A105, B105) abuts against a valve assembly (106); the spiral shaft (A102, B102) is axially controlled by a cam surface of a camshaft (101); and the spiral shaft (A102, B102) is provided with a spiral groove (A102D, B102D) and a blockage part (A102G, B102G). When the spiral groove (A102D, B102D) communicates with a limiting oil hole (A118, B118), a sliding sleeve cavity (Q) communicates with a low-pressure oil path of the engine for pressure relief; a spiral shaft axial projection portion (A102C, B102C) is provided at a first end of the spiral shaft (A102, B102); the spiral shaft axial projection portion (A102C, B102C) is provided with a spiral shaft abutting plane (A102B, B102B); a piston axial projection portion (A105A, B105A) is provided at the end of the piston (A105, B105) opposite to the spiral shaft (A102, B102); and the head portion of the piston axial projection portion (A105A, B105A) is provided with a piston abutting plane (A105B, B105B). The present invention solves the problem in which the normal operation of the system is affected due to machine oil loss in a sliding sleeve cavity, and enables the crank angle corresponding to a valve opening moment to remain unchanged, and is particularly suitable for applying to the control of the intake valve variable stroke of an engine having a scavenging process.

In an internal combustion engine provided with an electro-hydraulic system for variable actuation of the intake valves of the engine, each cylinder has two intake valves, which are associated with two intake conduits and are controlled by a single cam of a camshaft through a single hydraulic circuit. The communication of the hydraulic actuators of the two intake valves with a discharge channel is controlled by two electrically-actuated control valves, both of an on/off two-position type, arranged in series with each other along a hydraulic line for communication between the a pressure volume and the discharge channel.

A control device and method for controlling a compression release brake arrangement is provided. The compression release brake arrangement comprises an exhaust valve actuator assembly, a first actuator valve and a second actuator valve. The method comprises controlling the first and second actuator valves to a first state in which one of the actuator valves is open and the other one is closed. The disclosure further relates to a computer program, a computer readable medium, as well as to a vehicle comprising the control device.